I feel for you. I've never had Calleigh not like anyone. Can you stay while Ryan grooms her. It may make her feel better. I stay with my dog and she seems to do well. The only part that she pulls back from, is when her nails get done. He may have accidentally hurt her a little once and that's why she is reacting that way. I know my groomer Chris trimmed Calleigh's nail just a smidge too short and that's why she doesn't like that part of her grooming. My groomer is excellent too and I totally trust her. Accidents can happen.
Good luck.
